-simple design (2 buttons and wheel, by 2 buttons I mean left click right click, no side buttons)
-similar size
-similar height for nice russian style claw handle

The only thing I dont like about the WMO is it doesnht have native 1000hz, so I have to always run that annoying trick to overclock the USB port, and I only do it to 500hz because im scared 1000hz will break something. 500hz is good enough tho.

If there are no replacements for this great mouse, I will continue to enjoy it for years to come as I will buy the Fatal1ty motherboard with the USB port that can has native support for higher hz without having to run windows in test mode.

I have 3 more spare WMO.